Two-photon-pumped lasing in microdroplets.

@article{Kwok1992TwophotonpumpedLI,
  title={Two-photon-pumped lasing in microdroplets.},
  author={Alfred S. Kwok and Ali Serpenguzel and Wen-Feng Hsieh and Richard K. Chang and James B. Gillespie},
  journal={Optics letters},
  year={1992},
  volume={17 20},
  pages={
          1435
        }
}
Lasing is observed in laser-dye-doped ethanol droplets after two-photon absorption by the dye molecules. The two-photon-pumped lasing emission by the droplets is at a higher frequency than the input laser. Competitive nonlinear-optical effects that occur at high input-laser intensity are discussed. 
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TLDR
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TLDR
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TLDR
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TLDR
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TLDR
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